function remove_add_to_cart_button_from_specific_product()
{
    $product_id = 23396;
    if (is_singular('product') && get_the_ID() == $product_id) {
        remove_action('woocommerce_single_variation', 'woocommerce_single_variation_add_to_cart_button', 20);
    }
}
add_action('wp', 'remove_add_to_cart_button_from_specific_product');

function add_custom_button()
{
    $product_id = 23396;
    if (is_singular('product') && get_the_ID() == $product_id) {
        echo '<p>' . __('Prices available upon request') . '</p>';
        echo '<div class="header-right-icon-group singleBtnId open-modal">';
        echo '<a href="javascript:void(0)">' . __('Contact Now') . '</a>';
        echo '</div>';
        echo '<style>
            .single_variation_wrap{
                display:none !important;
            }
        </style>';
?>
        <div id="myModal" class="modal product_modal">
            <div class="modal-content">
                <span class="close">&times;</span>
                <?php echo do_shortcode('[gravityform id="1" title="false" ajax="true"]');  ?>
            </div>
        </div>
    <?php
    }
}
add_action('woocommerce_single_product_summary', 'add_custom_button', 31);

function product_modal()
{
    ?>
    <script>
        jQuery(document).ready(function() {
            jQuery(".open-modal").click(function() {
                jQuery("#myModal").css("display", "block");
            });

            jQuery(".close").click(function() {
                jQuery("#myModal").css("display", "none");
            });
        });
    </script>
<?php
}
add_action('wp_head', 'product_modal');

//Modal Css


.modal {
	display: none;
    position: fixed;
    z-index: 9;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    overflow: auto;
    background-color: rgb(0 0 0 / 87%);
    padding-top: 60px;
}

.modal-content {
    background-color: #fefefe;
    margin: 8% auto;
    padding: 20px;
    border: 1px solid #888;
    width: 50%;
}

.close {
  color: #aaa;
  float: right;
  font-size: 28px;
  font-weight: bold;
}

.close:hover,
.close:focus {
  color: black;
  text-decoration: none;
  cursor: pointer;
}
.product_modal label {
    color: #000;
    text-transform: uppercase;
    font-size: 13px !important;
    letter-spacing: 3px;
}